How to access nvimtree state? Want to toggle on focus, but not if already open.

[rtviii]

Hi there. I'd like to be able to swithc between buffer focus and nvimtree focus without toggling the tree needlessly. How do i find out the state of the tree? What's the best way to accomplish this otherwise?
In pseudocode, im roughly trying to do something like this :

function my_utility()
    if (nvimtree_is_open) 
    
             vim.cmd("NvimTreeFocus")
    else:
              vim.cmd("NvimTreeToggle")
              vim.cmd("NvimTreeFocus")
end

Thank you